Nut-lock.



R. L. ARMSTEAD.

NUT LOOK.

. APPLICATION FILED NOV.17, 1909.

Patented Nov. 1,1910.

ROBERT L. AEM'sTEAD, or SPRAGUE, WEST VIRGINIA.

NUT-nook;

Specification of Letters Patent.

Patented Nov. 1, 1910.

Application filed November 17, 1909. Serial No. 528,503.

I and efficient construction of nut lock which in applied position will effectually hold the nut as against any accidental unscrewing movement caused by arring or arising from any other cause, still at the same time permitting the nut to be unscrewed by the application thereto of a proper wrench, especially designed for the purpose, and the invention consists in certain constructions and arrangements of the parts that I shall hereinafter fully describe and claim.

For a full understanding of the invention, reference is to be hadto the following description and accompanying drawings, in which:

Figure lis a perspective view of a nut lock constructed in accordance with my invention, the same being shown in applied position; Fig. 2 is a longitudinal sectional view thereof; Fig. 3 is a perspective view of the parts detached and in juxtaposition to each other; Fig. 4 is a similar view showing the inner face of the outer washer; and, Fig. 5 is a perspective view of a wrench which may be employed to unscrew the nut.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

Referring to the drawings, the numeral 1 designates a bolt which is provided back of its threads with a square or otherwise noncircular portion 1. upon which the inner and outer washers 2 and 3 are designed to fit, being thereby prevented from turning when applied to the bolt. These washers are formed in their adjacent faces with registering transverse recesses designated 2 and 3 respectively, and the outer washer 3 is formed with an aperture leading outwardly from its recess 3 to the outer face of the washer, as clearly illustrated in the drawing.

5 designates a spring rod. This is mounted in the recess 3 of the washer 3 and is preferably held near one end only, as by an eye 6 formed in said recess, through which eye the spring locking rod 5 may be easily slipped and as easily removed when desired, in order to expedite the assembling and disassembling. of the parts. At its opposite end the rod 5 is outwardly turned, as indicated at 5 and extends through an opening 3 formed in the washer 3 to and beyond the outer face of said washer, whereby to constitute an unlocking handle. A pawl is mounted upon the spring rod 5, as by an opening formed in the inner end of the pawl by which it may he slipped on the rod, and the said pawl projects outwardly through the aperture 4 in the washer 3 to and beyond the outer face thereofand is provided with a toothed outer extremity designed for locking engagement with corresponding teeth 8 that are circularly arranged on the inner face of the nut 8.

From the foregoing description in connection with the accompanying drawing, it is obvious that after the washers have been placed on the bolt 1 and packed up and against the work, the subsequent screwing of the nut 8 upon the threaded portion of the bolt will finally bring the toothed face of said nut into engagement with the pawl and the latter will click over the teeth 8 until the nut has been screwed up to the desired point, whereupon the nut will be effectually prevented from unscrewing by the interlocking movement of the pawl with one of the teeth.

In order to unscrew the nut 8, the outturned end 5 of the spring locking rod 5 is provided, the same being designed for engagement by the beveled ends 9 of a forked wrench 10, the same being adapted to slip over the grooved edges 11 of the nut so as to engage with the outturned end 5 and press the free end of the spring rod backwardly into the recess 2 of the inner washer 2, thereby serving to withdraw the pawl from the teeth 8 and permitting the nut to be taken off. By the provision of the wrench 10 it is obvious that the nut can be unscrewed practically only by this special form of wrench and not by any ordinary turning movement without first pressing back the outturned end of the spring rod and thereby disengaging the pawl from the toothed face of the nut.

Having thus described the invention, what is claimed as new is:

1. The combination with a bolt, and a nut adapted to screw thereon, the nut being formed in its inner face with teeth, of washers mounted on the bolt back of the nut and held from turning on the bolt, said washers being formed in opposing faces with registering recesses, and the outer washer being formed with an eye in said recess, a spring rod mounted in the recess of the outer washer and passing through said eye and held at one end thereby, the other end of the spring rod being turned outwardly to and beyond the outer face of the outer washer, said washer being formed with an aperture leading from its recess to the outer face of said washer, and a pawl secured on said locking rod and protruding out through the aperture into locking engagement with the teeth of the nut.

2. The combination with a bolt, and a nut adapted to screw thereon, the nut being formed in its inner face with teeth, of washers mounted on the bolt back of the nut and held from turning on the bolt, said washers being formed in opposing faces With registering recesses, and the outer washer being formed with an eye in said recess, a spring rod mounted in the recess of the outer washer and passing through said eye and held at one end thereby, the other end of the spring rod being turned outwardly to and beyond the outer face of the outer washer, said washer being formed with an aperture leading from its recess to the outer face of said washer, and a pawl secured on said locking rod and protruding out through the aperture into locking engagement with the teeth of the nut, said pawl being formed with an opening by which it is slipped on the rod.

In testimony whereof I affix my signature in presence of two Witnesses.

ROBT. L. ARMSTEAD. [1,. s] Vitnesses A. A. LILLY,

T. J. MCGINNIs. 

